Lotto speaker



BEST AVAILABLE cop.

July 3, i928.

F. o. FARWELL wub ,SPEAKER original Filed Feb. 26;"1926 l Reissue'd July 3, 19.28.

UNITED STATES FAY o. FARWELL,

`eiser AVAILABLE com OF TOLEDO, OHIO.

LOUD SPEAKER.

Original No. 1,602,965, dated october 12, 1926, Serial No. 90,727, filed February 26, 1938. Application for reissue 'filed January 13,

My invention has for its object to provide aloud speaker for the amplification of the sound waves roducedby the diaphragm of a receiver whic is so constructed that it will 5 reproduce more perfectly and with a more pleasing effect than is reproduced by the loud speakers now commonly known in the art.

It has been found thatv the higher' tones, particularly, when produced staccato such as l0 that produced by a flute, piccolo, violin or the higher tones of a piano, are reproduced more accurately by use of aspealrer of the type' of the ordinary bell shaped horn, but this type of speaker fails to reproduce the lower fuller tones of the piano, saxophone or cello and softer low tones of the voice or any instrument. It has aisofbeen found that a loud speaker having av large flexible diaphragm ordisk, either flat or cone shape will reproduce' the lower tones of the instruments and of the voice, but will not properly reproduce the higher tones as well as the bell shaped horn. By my invention I have produced a loud speaker that will reproduce both the high and low notes,` and whether produced staccato or otherwise, and will soften the tones and produce a pleasing eiect.

The invention may be contained in loud speakers that may be varied in their details of construction and arrangement of parts, and to illustrate a practical application of the invention, I have selected a loud speaker.

containing the invention as an illustration of such structures and shalldcscribe it hereinafter. ,The structure selected is shown in the accompanying drawings. y l

Figure 1 illustrates a iront view ofthe loud speaker. Fig. 2 illustrates a side view of the loud speaker, a part being broken Fig. 3 illustrates a section through the neck and shows some of the details of construction.

The loud speaker l shown in the drawings has a part that is substantially French hprn shape, the tapering tube or horn 2 being curved -to conform substantially to a circle and extending into the bell or the prominent flare or' 4the horn. lt may be made of suitable fibrous or hardened pulp of the character commonly used in such horns. For purposes of manufacture, the horn 2 may be formed of two parts 3 and 4C, the part 3 constituting the body of the horn and the part 4 constituting the part located within the bell.

away to more clearly illustrate certain'parts.

1927. Serial No:` 161,016.

The part 4 may be connected to a plate 5 that may be secured to the horn by any suit-l able means andso as to fit or form an cextension ofthe tapering tube. The neck 6 terminates in front of the diaphragm, 7 that is connected to the armature 8 which is electromagnetically `actuated in the manner well known in the art to transform the electrical waves of current into sound waves.

The diaphragm 7 is connected to the armature by means of the rod 9 whereby the vis bratnlons of the armature will be transmittedto the diaphragm 7 and the sound produeed thereby magnified by the horn.

Iii-order to produce a smooth clear tone oany pitch and to modulate the tonereprodue tion, I have found that by locatinga seme--- what soft pliable diaphragm of large diameter that such elfects will be produced. As shown in the drawings, a cone shaped dim phragm 12 of comparatively stiff but thin fabric or of paper may be supported on the other end of the rod, 9. A pair of cone shaped washers lvmay be used for elampin the apex of the cone, vthe rod 9 being threade at'its ends and a suitable nut i4 being used for pressing the washers against the inside and outside of the apex of the cone shaped diaphragm 12. Thus the diaphragm is supn ported coaxially with the bell l5 of the-horn.

The loud speaker may be supported on a suitable base, such as the base 16,` and a con- I necting wire 17 for connecting the loud speaker to a radio set may pass from the receiving instrument of the loud speaker.' through the horn and through the base 16.

1. In combination. a large diaphragm tol produce one tone quality, a small diaphragm actuated inunison with the large diaphragm to produce sound waves, means to amplify the said sound waves to vproduce another tone quality in unison with the first. 'tone quality which producesal third tone uality f unlike either when produced separatgly the large diaphragm being directly in the path ot'. the amplified waves produced by the 'sm'dlle'r diaphragm.

llool In a loud speaker, a relatively small les BEST AvAaLgBLE coeI diaphragm. A

3. In a loud speaker, a'v relatively large diaphragm, and a' relatively small diaphragm,the said large diaphragm `operating tov produce one tone quality and means operating in unison with the large diaphragm for producing another tone quality, the said means and the large diaphragm together pro'ducinga third tone quality the large diaphragm being directl in the path of the amplified Vwaves pro uced by` the smaller diaphragm.

el. In a loud speaker, a horn having a hell portion and a curved tapering tube, the ta, pering tube terminating Within the hell, an eleetimnagnptically operated vdiaphragm located at the neck of the horn and means connected to the diaphragm for modulating `the tones prodiieed By the loud speaker.

5. In a loud speaker, a horn havin al bell vportion and a, curved tapering tue, the 'tapering tube terminating \`vithin the bell,

an elertrimagnetirially operated diaphragm loe-ated at the neck ol the horn, a llexihle diaphragm fil relative soft material connected to the first diaphragm.

G. In a, loud speaker, a horn haring a hell portion and a curved tapering tube7 the tapering tnhe terminating within the bell, an electromagnetieally operating diap y 'agln loeated at the neel; of the horn, a-lexihe diaphraginhaving a relative large'diameter, the center ot' the last named diaphragm located suhstantiallbY in the axis of the bell of the horn.

7. In a loud speakei-a horn having a hell portion and a eurred tapering tube, thel taperingtuhe terminating wit-hin the hell,V an eleetromagnetieally operated diaphragm located at the neck ot' the horn, a flexible' cone shaped .diaphragm connected to the first named diaphragm and located Coaxially with respect to the bell of thehorn` 1n testiniony whereof I have hereunto ksigned my naine to this speciieation.

FAY O. .FARYVELL 

